66353501 has 2 divisors, whose sum is σ = 66353502. Its totient is φ = 66353500.

The previous prime is 66353473. The next prime is 66353503. The reversal of 66353501 is 10535366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41860900 + 24492601 = 6470^2 + 4949^2 .

It is a cyclic number.

It is not a de Polignac number, because 66353501 - 2¹⁸ = 66091357 is a prime.

Together with 66353503, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66353503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33176750 + 33176751.

It is an arithmetic number, because the mean of its divisors is an integer number (33176751).

Almost surely, 2^66353501 is an apocalyptic number.

It is an amenable number.

66353501 is a deficient number, since it is larger than the sum of its proper divisors (1).

66353501 is an equidigital number, since it uses as much as digits as its factorization.

66353501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100, while the sum is 29.

The square root of 66353501 is about 8145.7658326274. The cubic root of 66353501 is about 404.8442239910.

Adding to 66353501 its reverse (10535366), we get a palindrome (76888867).

The spelling of 66353501 in words is "sixty-six million, three hundred fifty-three thousand, five hundred one".